{"title":"Adafruit 12-Key Capacitive Touch Sensor Breakout - MPR121","handle":"adafruit-12-key-capacitive-touch-sensor-breakout-mpr121","url":"/products/adafruit-12-key-capacitive-touch-sensor-breakout-mpr121","description":"The Adafruit MPR121 Capacitive Touch Sensor Breakout provides 12 channels of capacitive touch sensing over I2C. The MPR121 handles all the capacitive filtering internally and can be configured for varying sensitivity levels, making it far easier to use than raw analog capacitive sensing.\n\nWith four selectable I2C addresses via the ADDR pin, you can connect up to four breakouts on a single bus for a total of 48 touch pads. The board includes a 3V regulator and I2C level shifting for safe use with both 3.3V and 5V microcontrollers, plus an IRQ LED that blinks when touches are detected for easy visual debugging.\n\nKey Features\n\n\n12 Touch Channels – Independent capacitive touch inputs with built-in filtering\n\nI2C Interface – 4 selectable addresses for up to 48 pads on one bus\n\n3/5V Compatible – Onboard 3V regulator and I2C level shifting\n\nIRQ LED – Visual indicator blinks on touch detection\n\nConfigurable Sensitivity – Adjustable filtering and threshold settings\n\nCompact Breakout – Pre-soldered MPR121 chip ready for breadboarding\n\n\nAlso Available\n\n\nMPR121 Capacitive Touch Shield for Arduino – Shield format with alligator clip pads\n\n\nIdeal For\n\nInteractive touch interfaces and control panels\nMusical instruments and touch-based triggers\nProximity sensing and gesture detection\nReplacing mechanical buttons with touch pads\n\n\nPackage Contents\n\n1× Adafruit MPR121 12-key capacitive touch sensor breakout (assembled)\n1× 0.1\" header strip\n\n\n\nTip: For touch contacts, use copper foil or Pyralux and solder a wire from the foil pad to the breakout.\n\n\nSpecifications\n\n\nSensor Chip – MPR121\n\nTouch Channels – 12\n\nInterface – I2C (4 selectable addresses)\n\nLogic Level – 3.3V or 5V\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":13675,"title":"Default Title","sku":"AF-1982","price":16.61,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":100,"option1":"Default Title"}]}